add iOS<7 "support", too help this pod to be integrated to more project :)
add iOS<7 "support", too help this pod to be integrated to more project :)

iosphere/MMWormhole,pivotal-oscar/MMWormhole,HarrisLee/MMWormhole,sunyazhou13/MMWormhole,HarrisLee/MMWormhole,pivotal-oscar/MMWormhole,mutualmobile/MMWormhole,dezinezync/MMWormhole,alvincrisuy/MMWormhole,abaroody/MMWormhole,tomguthrie/MMWormhole,walmartlabs-wmusiphone/MMWormhole,0x73/MMWormhole,sunyazhou13/MMWormhole,tomguthrie/MMWormhole,jpmhouston/MMWormhole,wangmy/MMWormhole,dezinezync/MMWormhole,wangmy/MMWormhole